PG-1299 Removed deprecated extension from Contrib extensions table (#723)

Author: nastena1606

docs/contrib.md

@@ -51,4 +51,4 @@ Find the list of controb modules and extensions included in Percona Distribution
 |[tsm_system_time](https://www.postgresql.org/docs/16/tsm-system-time.html) | | Provides the table sampling method  SYSTEM_TIME, which can be used in the TABLESAMPLE clause of a SELECT command.|
 |[unaccent](https://www.postgresql.org/docs/16/unaccent.html) | |A text search dictionary that removes accents (diacritic signs) from lexemes. It's a filtering dictionary, which means its output is always passed to the next dictionary (if any). This allows accent-insensitive processing for full text search. |
 |[uuid-ossp](https://www.postgresql.org/docs/16/uuid-ossp.html) |Required | Provides functions to generate universally unique identifiers (UUIDs) using one of several standard algorithms |
-|[xml2](https://www.postgresql.org/docs/16/xml2.html) |Required | Provides XPath querying and XSLT functionality. It allows for complex querying and transformation of XML data stored in PostgreSQL.|
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